fix unhashable type error in agents-networks gis example

Author: wang-boyu

gis/agents_and_networks/src/agent/building.py

@@ -35,3 +35,6 @@ def __eq__(self, other):
         if isinstance(other, Building):
             return self.unique_id == other.unique_id
         return False
+
+    def __hash__(self) -> int:
+        return hash(self.unique_id)